Hey, Siri, can you read my hidden messages to everyone? Sure, press that button

Thankfully, this is only valid for third-party apps like Facebook Messenger, the workplace Slack chats or Gmails, for instance, but still the implications may not be pleasant for a dedicated individual bent on learning what you just got on the phone you left at the table. When you hold down the home key (or the side button on the iPhone X), you will be greeted with Siri's old bot-like timbre that will read out the sender and a few lines from the third-party message that's in the balance, as well as the subject line, if any.
If you don't want Siri to do that while Apple eventually looks into the matter (it's been reported already), simply turn off lock screen notifications for those chat or mail apps whose messages you don't want to be read by Siri out loud with the press of a button for the whole room to hear.
Things that are NOT allowed:
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